import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
import uwcse.io.Input;

public class FileInput {
	public static void main(String[] args) {
		Input in = new Input();
		String fileName = in.readString("Enter the file name: ");

		File file = new File(fileName);
		try {
			Scanner scan = new Scanner(file);
			int[] count = new int[26];
			// count[0]: number of a's
			// count[1]: number of b's
			while(scan.hasNext()) {
				String line = scan.nextLine().toLowerCase();
				// count the number of a's, b's, etc.
				for (int i = 0; i < line.length(); i ++) {
					char c = line.charAt(i);
					if (c >= 'a' && c <= 'z') {
						count[c - 'a']++;
					}
				}
			}
			for (int i = 0; i < count.length; i ++) {
				System.out.println("Letter " + (char)(i + 'a') + " appears " +
						count[i] + " times.");
			}
		} catch (FileNotFoundException e) {
			System.out.println("File not found");
		}
	}

}